Mincon MP55

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Table of Contents1. INTRODUCTION ..................................................................................................................................... 32. INSTALLATION AND OPERATION ....................................................................................................... 32.1 SAFETY ................................................................................................................................................................... 32.2 HAMMER CARE. ....................................................................................................................................................... 32.2.1 Storage ............................................................................................................................................................ 32.2.2 Commissioning ................................................................................................................................................ 32.2.3 Lubrication ....................................................................................................................................................... 32.2.4 Operation ........................................................................................................................................................ 42.3 SERVICING .............................................................................................................................................................. 42.3.1 General ........................................................................................................................................................... 42.3.2 Opening Chuck and Backhead ....................................................................................................................... 52.3.3 Dismantling Hammer to Change Drill Bit ........................................................................................................ 52.3.4 Disassembly for Full Servicing of Hammer ..................................................................................................... 52.3.5 Inspection ........................................................................................................................................................ 52.3.6 Checking Wear Limits ..................................................................................................................................... 52.3.7 Reassembly .................................................................................................................................................... 63. TROUBLE SHOOTING ........................................................................................................................... 74. APPENDIX .............................................................................................................................................. 84.1 DTH HAMMER EXPLODED VIEW AND PARTS LIST AND TECHNICAL DATA .................................................................... 84.2 HAMMER SERVICE LOG ............................................................................................................................................ 95. WARRANTY ............................................................................................................................................ 9Mincon Rockdrills – “The Driller’s Choice” Page 2
1. IntroductionThank you for choosing the Mincon MP55 Down-the-Hole hammer. Please read this manual carefully before using your hammer inthe interests of safety, warranty and best operational care. The Mincon MP55 is ruggedly built with a hardened wear sleeve towithstand the stresses of drilling in the most extreme conditions. However, on the inside it is a precision tool with care taken inmanufacture to ensure that the components meet finely matching tolerances to provide fast drilling, reliability and efficient use of airwithout waste. With correct care your Mincon MP55 hammer should provide you with top performance reliability and long servicelife.Warranty is provided by Mincon as per the warranty section 5.Please keep this instruction manual as a permanent part of your DTH Hammer.The specifications and instructions contained in this manual are based on the up-to-date information as at publication date.2. Installation and Operation2.1 SafetyBe sure to work safely at all times. Wear protective clothing and safety equipment and observe all safety regulations as prescribedby your employer, Government, or the site on which you work. Do not wear loose clothing that may get caught in rotating parts andcause serious personal injury.Remember that a “Down-the-Hole” percussive hammer emits noise and you should therefore take every precaution to safeguardyour hearing against damage by using proper ear protectors. Use eye protection at all times. Rock chips and dust which may bedischarged from the face of the bit or bore hole at high velocities and can cause severe injury.Hammers can be heavy – Always use proper and approved lifting equipment and take every precaution to safeguard yourselfagainst injury. Keep hands clear at all times – Beware of getting fingers trapped between the chuck and bit and do not use hands orfeet to clear the top of the borehole at any time.Other safety advice is given throughout this document which you are advised to read.2.2 Hammer Care.2.2.1 StorageIf you intend to store the Hammer, we recommend that ½ pint (¼ litre) of good quality rock drill oil be poured into the hammer toprotect it. The oil should be poured through the backhead and by using a long screwdriver inserted into the backhead; the checkvalve can be depressed to allow the oil to run down into the piston chamber. Ensure that the thread protector and chuck cap arefitted to keep debris out and to prevent oil leakage. Store the hammer horizontally in a clean dry place.2.2.2 CommissioningAlways use reputable drill bits in good condition. Using overrun bits will effect penetration rates, and reduce chuck life significantlydue to excess cuttings wash.Coat the drill bit shank and the hammer threads with grease for protection and easier dismantling. Prior to use, lubricate thehammer with ½ pint (¼ litre) of rock drill oil as described above.Fit the hammer to the drilling rig ensuring no debris or dirt enters the hammer from the site, dirty tubes or from unclean air lines.Make sure that the coupling threads from the drill are of the same specification to that of the hammer and they are in goodcondition. Run the hammer at half the air flow for a few minutes to allow the oil to flow through and for internal components to settlein.2.2.3 LubricationIt is vital for DTH hammers to receive a constant supply of proper rock drill oil to protect the internal components and to provide agood air seal between the piston and the inner cylinder, and the piston and the wear sleeve for efficient drilling. The correctconsumption of oil is dependent upon the air volume and conditions. Please refer to the lubrication graph below forrecommendations. When drilling in wet conditions the normal amount should be doubled. There should be visual evidence of oilaround the drill bit shank and within the tube joints when changing tubes.The recommended grade of oil is dependent on the ambient temperature in which drilling is taking place as well as the operatingpressure. As a rule of thumb, ISO320 grade rock drill oil should be used whenever possible as the hammer is a high frequency tool,however, where the pump cannot pump the oil in colder conditions, a lower grade of oil can be used as per the graph below.Mincon Rockdrills – “The Driller’s Choice” Page 3
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Page 7 and 8: 3. Trouble ShootingProblem Possible
Page 9 and 10: 4.2 Hammer Service LogWEARSLEEVE /

Mincon MP55

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